Who's blonde guy for real? When did he even appear eh?

Wolf’s supposed ex boyfriend who is now dating MLs sister. He had scars on his arm that puppers thinks was inflicted by the ML. He was introduced a few chapters ago when MC was in dog mode and blondie came into the office with the wolf’s sister and said he’d kill his sister if she got in the way.

Oh yeah I needed to re-read, I forgot I read those chapters in raws lol, didn't even know he had ex or even sister